Micrometer calipers



C. F. GERHARD MICROMETER CALIPERS Filed June 17, 1954 Oct. 22, 1957 2,810,201

Il Illlllllll l IN VEN TOR. ffy/@wif ZX/xyz? iyf//WM MICROMETER CALIPERS Charles F. Gerhard, Weatherly, Pa., assignor of fifty percent to Laforest S. Saulsbury, New York, N. Y.

Application June 17, 1954, Serial No. 437,320

3 Claims. (Cl. 33-147) This invention relates to Ymicrometer calipers for measuring and checking work pieces.

It is an object of the present invention to provide a micrometer caliper with means for lifting the movable micrometer spindle jaw to permit the easy application of the jaw members over the work pieces and wherein the lifting of the spindle jaw is permitted for :any setting of the micrometer spindle jaw upon a given work piece.

It is another object of the invention to provide a micrometer caliper having the usual barrel graduations of measurement on the inner and adjustable outer thimble sleeves and in addition a check indicator on the end of the outer sleeve connected to the spindle jaw so that an oversize or undersize reading can be readily taken upon through a vertical opening 14. Above this opening 14 is an internally threaded upstanding sleeve projection 15 on which caliper graduations 16 are disposed. -Fixed to the upper end of the sleeve projection 15 is an externalinternal threaded adaptor 16.

Surrounding the sleeve projection 15 is thimble sleeve means 17 having an internal sleeve 18 xed to its upper end. This internal sleeve 18 has external threads throughout a portion thereof which engage with the nternal threads -of the threaded sleeve 16. This thimble sleeve 17 has the usual tapered end as indicated at 19 with Vernier graduations thereon where the exact reading in thousandths of an inch is taken.

The movable spindle 13 is surrounded by a collar 2) lying within the opening 14. This collar 20 has a threaded hole 21 into which a knurled set screw 22 can be tightened to engage the face of the spindle jaw 13 and secure the collar 20 thereto. This collar 20 is made secure tothe spindle jaw 13 after the spindle jaw 13 has 0 been set by means to be further described and by turning release of the slidable jaw into position upon the work piece.

It is another object of the invention to provide -in a micrometer caliper with lost motion means for holding the spindle jaw in engagement with the lower end of an indicator post and upon the thimble sleeve so as to be axially adjustable therewith without rotation as the thimble sleeve is turned and permitting the lifting lever to lift the spindle independently of the thimble sleeve means when the spindle jaw is released to place the calipers over the work piece.

Other objects of the invention are to provide a micrometer caliper having the above objects in mind which is of simple construction, requi-res only the minimum of added parts to the standard micrometer, inexpensive to manufacture and assemble, durable and accurate, convenient to use, easy to read and adjust, and adapted to quickly indicate oversize and undersize work pieces and the exact amount of the variation or tolerance.

For other objects and a better understanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which:

Figure l is a perspective view of a micrometer caliper embodying the features of the present invention;

Fig. 2 is an enlarged fragmentary sectional view of the upper part of the caliper as viewed on line 2 2 of Fig. 1;

Fig. 3 is an enlarged fragmentary and collective view of several of the parts of the caliper including the added parts serving to effect the release of the movable jaw to accommodate the caliper to the work piece and the rotary auxiliary check indicator.

Referring now to the figures, 10 represents a U-shaped frame having on one side a xed anvil 11 thereon that is secured by Ia screw 12. This anvil 11 can be adjusted to the desired zero location and to accommodate the anvil 65 tudinally aligned and connected for slidable adjustment with respect to the anvil 11, an axially movable spindle 70 jaw 13 having its end adapted to engage the work piece above the anvil 11. The spindle jaw 13 is slidable the thimble sleeve 17.

The lower end of the collar 20 has a notch 23 therein into which the lower end of a lever 24 extends for engagement with the collar 20. This lever lies in an opening 25 communicating with the opening 14 and is pivotally connected to the frame 10 by a pivot pin 26. The lever 24 has a thumb pad 27 on its outer end and when engaged by the thumb will cause the lever 24 to be pivoted downwardly and the collar 20 with the spindle jaw 13 upwardly so as to provide release of the spindle jaw 13 and the easy engagement of the caliper with the work piece.

Above the collar 20 is a coil spring 28 which engages with the upper edge thereof and which also engages with the lower end of the double threaded sleeve adaptor 16. This spring 28 tends to urge the spindle jaw 13 toward the work piece upon the lifting lever 24 being released.

Upon turning the thimble sleeve 17, the spindle jaw member 13 will be adjusted to indicate the exact dimension of the Work piece. `Once this is determined, the thimble sleeve 17 is left in its setting and thereafter fur-y ther readings will be taken from a dial indicator mechanism 29 fixed to the upper end of the thimble sleeve 17 by set screws 30 and 31.

This dial indicator mechanism 29 has a depending shaft 32 that has a spiral groove Y33 therein. The lower end of this shaft is supported by a U-shaped depending projection 34 against the under edge of which bears .a compression spring 35 that reacts against a shoulder 36 of 0 an indicator post 37 so that the indicator post 37 will be urged downwardly through the internal sleeve 18 for engagement with the upper end of the movable spindle jaw 13.

The upper end of the movable spindle jaw 13 has an annular recess 38 into which a spring linger 39 extends for engagement with a shoulder 40 provided by the upper face of the recess 38 and which tends to hold the upper end `of the slidable spindle jaw 13 in engagement with the lower end of the indicator post 37. The spring 35 will urge the indicator post 37 against the upper end of the spindle jaw 13 and the shoulder 40 against the end of the finger 39. The upper end of the indicator post 37 is relieved throughout a considerable distance to provide a recess to accommodate the compression spring 35 and parts of the check indicating mechanism -and has at its upper end a shoulder 42 for engagement with the spiral groove 33 of the indicator depending shaft 32. This shoulder 42 will work the rotatable shaft 32 to locate indicator arm 43 either to one side or the other of zero mark 44 on the indicator mechanism 29.

The finger 39 will cause the spindle jaw 13 to be lifted against the action of the spring 28 when the thimble sleeve 17 is turned. The nger 39 can turn about the end of the spindle jaw 13 and in the recess 38. The nger 39 will also prevent the spindle 13 from being lost or lowered through the collar 20 upon the collar being released from the spindle jaw 13 by release of the set screw 22. The set screw 22 extends through a ver tical slot 45 to permit the vertical movement of the collar and the spindle jaw 13 by the lifting'nger 24.

Once the measured thickness or diameter of the work piece is ascertained, the caliper can be `applied to any other work piece and determine to what extent the Work piece is either undersize or oversize.

It should now be apparent that there has been provided a simple arrangement of parts to permit the lifting of the slidable jaw for the engagement of the calipers with the work piece and a simple indicating mechanism toindicate the undersize or oversize. Once the calipers are adjusted, `it is an easy matter to test the dimensions of the work pieces for a given size.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as dened by the appended claims.

What is claimed is:

1. A micrometer caliper for measuring and checking the dimensions of work pieces comprising a U-shaped frame, an anvil jaw on one side of the frame, a spindle jaw axially movable throughthe other side of the frame and opposing the anvil jaw, a set collar releasably connected to the spindle jaw for adjustment thereupon, a lifting lever pivoted upon the frame and engageable with the set collar to lift the spindle so as to free it from the work piece and to permit the easy application of the caliper thereupon, an upstanding sleeve projection on said frame surrounding the axially movable spindle jaw, thimble sleeve means axially adjustable upon the upstanding projection, and having an internal guide sleeve depending into said sleeve projection, spring means reacting between the sleeve projection fan'd the set collar to normally urge the spindle jaw toward the work piece, .an indicator mechanism carried by the adjustable thimble sleeve meanshaving check graduations thereon, an indicator post axially movable in said guide `sleeve and adapted to abut the `upper. end of the spindle jaw, lost motion means connected between the lower end of internal sleeve and the upper end of the spindle jaw for adjusting the spindle jaw by the thimble sleeve means but permitting the lifting lever to release the spindle jaw independently of the thimble `sleeve means and spring means reacting between the check indicator mechanism and the indicator post for maintaining the indicator post in abutment with the spindle jaw and in operable engagement with the operating parts of the check indicator mechanism.

2. A micrometer caliper for measuring and checking the dimensions of work pieces as dciined in claim l, said internal sleeve being threaded upon the upstanding sleeve projection and said lost motion means for connecting the upper end of the spindle -jaw to the lower end of the internal sleeve including an annular recess on the upper end of the spindle jaw and a spring finger depending from the lower end of the internal sleeve and engageable with one side ofthe annular recess on the upper end of the spindle jaw, whereby rotation of the thimble sleeve means may be made to adjust the spindle jaw.

3. A micrometer caliper for measuring and checking the dimensions `of work pieces as defined in claim 2, and said indicator post being relieved upon its upper end to provide a recess, said check. indicator mechanism having a depending projection extending into the upper end of the internal sleeve and into the `relieved recess of the` indicator post and a rotatable shaft journalled upon the depending projection and having a spiral groove, said spring means for maintaining the indicator post in abutment with the spindle jaw reacting between the depending projection ofthe indicator mechanism and the lower end of the recess and a tip shoulder on the upper end of the indicator post engaging with the spiral groove of the depending shaft of the indicator mechanism.

References Cited in the le of this patent UNITED STATES PATENTS 1,384,710 Morell July l2, 1921 2,344,595 Calow et al Mar. 21, 1944 2,504,212 Mennesson Apr. 18,

FOREIGN PATENTS 238,165 Switzerland Oct. 1, 1945 

